Brad,
The Innovate loggers will show Lamda. This is the easiest, most straightforward to do the testing you want. I know, I know, I haven't switched over myself (yet), but I'm also not looking for the level of difference of you are.

Do your tests looking at lamda, convert it later if you want for curiosity.
As BBM stated, Lamda is what the wideband interprets as stoich regardless of the fuel.

As to which fuel, what do you think the engine needs?
Match the fuel to the compression. Sunoco Race fuel must have a rep to help with this.
Remember this post where Shrinker changed fuels twice as the compression came up during dyno runs?
http://motorsportsvillage.com/forum/viewtopic.php?f=6&t=9920

I'd avoid pump fuel for your testing. Too many different flavors depending on where and when its bought, never mind batch variations.
I'd also either commit to an oxygenated fuel or not. Think about maybe running a Ethanol blend since that's what's in most pump gas (unless you go upstate) and you plan to mix for street driving. yes? Then put a few gallons of non-eth race fuel in the tank for winter storage.